STMicroelectronics STEVAL-ISA084V1

Overview

STEVAL-ISA084V1 from STMicroelectronics is a 4 A, 800 kHz fixed-frequency PWM synchronous step-down demonstration board based on the ST1S40 DC-DC converter IC, designed for evaluating high-efficiency point-of-load regulation in industrial and embedded power supplies with 4–18 V input and regulated 3.3 V output.

For engineers reviewing the STEVAL-ISA084V1 datasheet, STEVAL-ISA084V1 pinout, STEVAL-ISA084V1 application, or STEVAL-ISA084V1 equivalent, this board enables rapid validation of thermal performance, transient response, and enable-controlled startup/shutdown behavior under real-world load conditions up to 4 A.

Technical Context

The board implements the ST1S40's peak-current-mode control architecture with internal compensation, eliminating external loop compensation components. It operates at a fixed 800 kHz switching frequency to minimize output filter size while maintaining >90% efficiency at 3.3 V/4 A output across 4–18 V input range.

Protection features include cycle-by-cycle overcurrent limiting and short-circuit foldback with frequency reduction. The enable (ON/OFF) function provides precise system-level power sequencing control, and all critical passives-including low-ESR ceramic input/output capacitors and shielded power inductors-are optimized for low noise and stable operation.

Key Specifications

Availability

STEVAL-ISA084V1 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, FPGA carrier boards, and embedded computing power subsystems requiring stable component supply and fast evaluation turnaround.

Supply support for STEVAL-ISA084V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, delivering silicon solutions for automotive, industrial, and consumer applications with emphasis on power efficiency and system integration.

The STEVAL-ISA084V1 belongs to ST's STEVAL demonstration board portfolio, engineered to accelerate design-in of ST's high-performance DC-DC converters by providing fully tested, layout-optimized reference implementations with documented test data.

FAQ

What input voltage range does the STEVAL-ISA084V1 support?

The board accepts 4 V to 18 V DC input, matching the operating range of the ST1S40 controller. This covers common industrial supply rails such as 5 V USB-PD sources, 12 V DIN-rail supplies, and 15 V legacy systems. Input voltage must remain within this window to ensure proper regulation and protection functionality.

Can the output voltage be adjusted to values other than 3.3 V?

No-the STEVAL-ISA084V1 is factory-configured for fixed 3.3 V output using a precision resistor divider network. While the underlying ST1S40 supports adjustable outputs down to 0.8 V, this demo board lacks onboard feedback resistor pads or jumpers for reconfiguration; modification requires PCB-level changes and recalibration.

Does the board include thermal monitoring or overtemperature shutdown?

No-STEVAL-ISA084V1 does not integrate temperature sensing or thermal shutdown circuitry. Protection relies solely on the ST1S40's current-limiting mechanisms. Thermal performance is validated via copper pour and component placement; users must verify board temperature rise under target ambient and airflow conditions during system integration.

Is an external programming tool required to operate the STEVAL-ISA084V1?

No-operation requires only a DC input source, load, and optional oscilloscope for waveform analysis. The enable pin is accessible via header J1, allowing simple logic-level control without firmware or configuration software. No programming, calibration, or host interface is needed for basic functional evaluation.